Day and Night are males, Sun is female.
Feel free to PM me any twists you want to impliment to my characters, plots or backstories. Here is my thoughts on the horseman of the apocalypse this...
[quote= ]'I would like to ask you ,' said Vasilisa, 'about the horsemen. Who was the white horseman who rode past me in the forest?'
 'That was dawn, my bright dawn,' answered Baba Yaga, beginning to grind her teeth.
'And who was the red horseman?'
 'My servant, my red sun,' answered Baba-Yaga, grinding her teeth a little more this time.
'Who was the black horseman?'
 'My servant, my black, dark night,' answered the old witch fiercely. 
'Any other questions?' she shrieked suddenly, her eyes flashing wildly. 'Speak!'
 Vasilisa thought of the three pairs of hands and was about to ask about them, but quickly stopped herself on seeing the frenzied look in the witch's eye.[/quote]
Each horseman comes/appears according to their name.
The white rider rides by at dawn, the red rider at high noon, and the black rider at the onset of night.
'Day/Dawn' - 'High Noon Sun' - 'Night'
If she had asked about the last thing, she would have seen the last horseman. She would have seen death on his pale horse before he delivered death to her.